Water-gage.



No. 839,369 PAT-ENTBD DEC. 25, 1906.

A. 'DITN'ER. WATER-GAGE.

APPLIOATION FILED D30. 21. 19:53.

fl'z'ivzebmar; Ewen-w;

I THE NORRIS PETERS co., WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

ALBERT DITNER, F METLHAUSEN, GERMANY, ASSIGNOR or ONE-HALF TO EMIL ENGASSER, OF OOLMAR, ALSACE, GERMANY.

" Specification of Letters Patent.

WATE'R-GAGE.

Patented Dec. 25, 1906.

Application filed December 21, 1903. Serial No. 186,067.

German Empire, have inventednew and useful Improvements in Water Gages, of

. which the following is a specification.

of steam necessary to close the valves ma however, be caused without breakage of the The devices usually employed for auto matically preventing the escape of steam and water on breakage of the glass of water-gages on steam-boilers usually consist of ball, clack, or swing valves located direct in the steam and water passages of the gage. On'

the glass breaking these valves are closed by the rush of steam occasioned. The current glass by a variation of pressure in the boiler Withoutfthe engineman observing it. Furthermore, such valves located direct in the steam and Water passages greatly contribute to the accumulation of mud and hard deposits. Both these circumstances'may lead to the most serious consequences, as the gage then no longer gives a correct indication.

, The purpose of my invention is to overcome the defects referred to by providing the valves outside the steam and water passages of the water-gage and by employing steam direct from the boiler to close the valves on the glass being broken.

My invention is illustrated by the accom panyingdrawing, in which the figure shows in elevation and part section one form of the new gage.

a is a casing provided with a thread h, by which means it can be screwed into the cock attachment u. b is a small piston working easily within the casing a. This piston is screwed to the rod 6', which is guided in the narrow neck y of the casing a and terminates,

in a conical valve 0. f is a spring coiled around the piston-rod e and bearing against the neck y above and the piston b below. The neck y is perforated by a number of holes Z. s is a nipple projecting from the casing a and over which the nut zis screwed for the purpose of effecting a steam-tight joint between the pipe (1 and nipple s. The said tube (1 may either lead into the passage of the cock attachment 'u or to the boiler direct. v is a three-Way cockfor blowing off spring f the piston b will remain in its lower-' most position. The passage of water and steam through the bores of the seatings u will therefore be wholly unobstructed. If, however, the gage-glass w breaks, the pressure on the top of the piston b ceases suddenly, and the boiler-pressure acting on the lower face of the piston forces the latter upward until the valve 0 sits in its seat -t formed in the passage leading to the water-gage glass 10, whereby the escape of water and steam is prevented.

The device at the top of the gage-glass acts in exactly the same manner as that at the bottom, being the inverted counterpart of the latter. r

i The device is suitable for application to ordinary water-gages for boilers and other like apparatus in which the level of the liquid has to be continually watched.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is'

In water-gages a device for automatically preventing the escape of steam and Water on the gage-glass breaking, comprising a hollow casing, a seating and a pipe (1, the hollow casing communicating at one end direct with the bore of the seating, and at the other end with the pipe (I through which pressure is transmitted directly from the apparatus on which the gage is mounted, and a piston located I within the casing, balanced in favor of the pressure on-the seating-bore side, and on breakage of the gage-glass effecting closing of the passage from the bore to the glass, all 

